TY  - BOOK
AU  - Sprent,Janet I  .
AU  - Sprent ,Peter  .
TI  - Nitrogen fixing organisms;pure and applied aspects / 
SN  - 0412346907
U1  - 59.90133 
PY  - 1990///
CY  - London : 
PB  - Chapman and Hall , 
KW  - NITROGEN-FIXATION
N1  - Includes bibliography and index
ER  -